From archibalds useful link
''As a doctor in training you’ll earn a basic salary, plus pay for any hours over 40 per week, a 37 per cent enhancement for working nights, a weekend allowance for any work at the weekend, an availability allowance if you are required to be available on-call, and other potential pay premia.
In Foundation training, you will earn a basic salary of £29,384 to £34,012 (from 1 April 2022).
If you’re a doctor starting your specialist training in 2022 your basic salary will be £40,257 to £53,398.''
....so £15 an hour will be right if in there first year (under training&supervison) and does no weekends, out of hours etc....